How to collect terms based the total power of x and y in (x + y +

*To*: mathgroup at smc.vnet.net*Subject*: [mg92158] How to collect terms based the total power of x and y in (x + y +*From*: Peng Yu <PengYu.UT at gmail.com>*Date*: Mon, 22 Sep 2008 05:25:01 -0400 (EDT)

Hi, In[(x + y + 1)^3 // Expand The above command gives me the following results. 1 + 3 x + 3 x^2 + x^3 + 3 y + 6 x y + 3 x^2 y + 3 y^2 + 3 x y^2 + y^3 I'm wondering how to collect terms based on the sum of the power coefficients of both x and y. For example, I want the following 1 + (3 x + 3 y) + (3 x^2 + 6 x y + 3 y^2) + (x^3 + 3 x^2 y + 3 x y^2 + y^3) Thanks, Peng